i-phone 4 3 Axis Gyro

Hi,
a question for the tech experts out there!!

I have an App installed called "gyroscope" that is supposed to utilize the phones new 3 Axis Gyro sensor system.
I tried it out whilst flying myself in an Aircraft yesterday ( yes I'm a Pilot and I'm aware of how a Gyro works ) and when the Aircraft banks left or right the i-phone Gyro shows no bank at all. If the phone had a real gyro installed then it should have shown the aircraft bank.So it seems the Gyro is rubbish or just a gimmick.

You need to actually move the phone itself to show any change on the phones gyro.

Whats the deal?

Thanks